坡膛结构变化对火炮内弹道性能影响的研究  

Study on Influence of Bore Structure on Gun's Interior Ballistic Performances

作　　者：孙河洋[1] 马吉胜[1] 李伟 生龙波[1] 吴大林[1] 刘海平[1] 

机构地区：[1]军械工程学院火炮工程系,河北石家庄050003 [2]海军航空兵学院教研部,辽宁葫芦岛125001

出　　处：《兵工学报》2012年第6期669-675,共7页Acta Armamentarii

摘　　要：考虑了经典内弹道方程组和弹带挤进过程的耦合效应,以内弹道方程组的解作为弹带挤进过程数值模拟的力边界条件,同时以数值模拟的结果作为内弹道方程组下一增量步计算的初始条件。引入了Lemaitre提出的基于连续损伤介质力学的考虑粘塑性及韧性损伤耦合效应的本构模型来模拟弹带材料的损伤失效过程,采用了Von Mises屈服准则、Johnson-Cook硬化模型及John-son-Cook失效模型,考虑了大应变、高应变率、温度软化作用、初始损伤及累计损伤失效效应,并借助一种高效的时间积分方法通过Abaqus\Explicit模块的材料子程序接口VUMAT将其引入到显式非线性有限元软件中,借助显式非线性有限元算法对两种坡膛结构下弹带挤进过程进行了数值模拟。分析了两种不同坡膛结构对弹带在挤进过程受力状态的影响,同时指出坡膛结构及弹带应力状态对火炮内弹道性能的影响,为火炮坡膛的设计提供了有益的参考。Considered the coupling effects of classical interior ballistic equations and band＇ s engraving process, the solution of interior ballistic equations was taken as the boundary condition of the simulation for engraving process, and the results of the simulation were taken as the initial conditions for the interior ballistic equations in the next step iteratively. A coupled constitutive model considered viseo-plastieity and ductile damage and based on continuum damage mechanics was introduced to simulate the band＇ s damage process. The Von Mises yield criterion, Johnson-Cook hardening model and Johnson-Cook frac- ture strain model were adopted, and the model considered large strain, high strain-rate, thermal softening and damage evolution. The model was implemented in the explicit finite element code by using VUMAT subroutine of Abaqus／Explicit module. The band＇s engraving processes of two different bore structures were simulated, and the influences of different engraving conditions on the stress state of the band were analyzed. The effects of band＇ s stress state and bore structure on the interior ballistic performances were pointed out. It is very useful for the design of bore structure.

关 键 词：应用力学 弹带 坡膛 冲击 累计损伤失效 内弹道 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]